GASTROCOPTA, SOUTH AMERICA. 93 



lengthened, obliquely truncate fold on the parietal wall ; one 

 on the columella ; a third small basal one ; fourth tooth dis- 

 tinct, in the middle of the right margin; the fifth smallest, 

 obsolete, in the upper margin. Peristome thin, narrowly ex- 

 panding throughout, the right strongly curved above, colu- 

 mellar margin somewhat dilated. Length 2, diam. 1 to 1.2 

 mm. 



"Differs from P. oblonga, by the shorter, ovate shell, with 

 the whorls but little convex, the parietal tooth protracted and 

 truncate, etc." (Doering}. 



Argentina : Province of Entre-Rios, around La Paz, and in 

 Corrientes, in the woods along the Rio Guayquirazo, living 

 under decaying tree trunks; also Bajo de Velis, in the Sierra 

 de San Luis (Doering). 



P. [upa] microdonta DOERING, Apuntes sobre la fauna de 

 moluscos de la Republica Argentina, pt. 4, in Boletin de la 

 Academia Nacional de Ciencias de la Rep. Argentina, iii, 

 1879, p. 82. Nachrichtsblatt d. deutschen Malak. Ges., 1880, 

 p. 84. 



In the Nachrichtsblatt for 1880 it was said to be identical 

 with Pupa pazi Hidalgo, probably on Doering 's authority. 

 The description indicates rather a species similar to 0. ser- 

 vilis, but of smaller size, close to G. pellucida. 



29. GASTROCOPTA CLESSINI (Doering). 



"Shell subperforate, minute, oblong, cylindrically conic, 

 thin, delicately striatulate, a little shining, buff-corneoua. 

 Spire long, slender, conic-cylindric, the apex rather obtuse. 

 Whorls 5 to 6, very convex, gradually increasing, the first 

 hyaline-corneous, smooth, the rest buff-corneous. Suture 

 deep, wide. Aperture truncate, semioval, three-toothed: one 

 compressed, pliciform tooth in the parietal wall; the second 

 tongue-shaped, on the columella ; the third deep in the palatal 

 wall. Peristome white, thin, expanded throughout, a little 

 reflected. Length 2 to 2.2, width 0.8 to 0.9 mm.; aperture 

 0.7 mm. long, 0.6 wide" (Doering). 



Argentina: abundant in suitable places in the Sierra de 

 Cordoba, as, for example, the valley of the Rio Primero, Rio 



